/* ==========================================================================
   Health-Decoder.com 全站統一設計規範 (Design System v5.0)
   標準：WCAG 2.1 AA 無障礙規範 | 2026 DTC Bento Grid 模組化佈局
   ========================================================================== */

:root {
  /* 品牌核心色系 (Brand & Semantic Colors) */
  --color-primary: #0F172A;        /* 深海軍藍：專業、理性、系統工程 */
  --color-primary-dark: #020617;   /* 極深黑藍：深色強調 */
  --color-primary-light: #F1F5F9;  /* 柔和淺藍灰底色 */
  --color-accent: #0D9488;         /* 薄荷墨綠：生機、細胞修復、健康安全 */
  --color-accent-hover: #0F766E;   /* 墨綠懸停 */
  --color-accent-light: #CCFBF1;   /* 淺薄荷綠膠囊標籤底色 */
  --color-accent-text: #115E59;    /* 墨綠文字色 */
  
  --color-wa: #25D366;             /* WhatsApp 官方品牌綠 */
  --color-wa-hover: #1EBE5D;       /* WhatsApp 懸停綠 */
  
  --color-danger: #EF4444;         /* 紅旗警告色 */
  --color-danger-bg: #FEF2F2;      /* 紅旗底色 */
  --color-warning: #F59E0B;        /* 提示黃色 */
  
  /* 文本與背景體系 (Text & Backgrounds - 12:1+ 對比度) */
  --color-text-main: #1E293B;      /* 深石墨灰：極高清晰正文，無眩光 */
  --color-text-muted: #475569;     /* 輔助灰色 */
  --color-text-sub: #64748B;       /* 次要灰色、條款文字 */
  
  --color-bg: #F8FAFC;             /* 舒適暖白/極淺灰頁面底色 */
  --color-surface: #FFFFFF;        /* 純白卡片/組件背景 */
  --color-border: #E2E8F0;         /* 淺灰邊框分隔線 */
  
  /* 向後兼容相容變數 (Backward Compatibility Aliases) */
  --primary: var(--color-primary);
  --primary-dark: var(--color-primary-dark);
  --primary-light: #F0FDFA;
  --secondary: var(--color-accent);
  --accent: var(--color-accent);
  --accent-hover: var(--color-accent-hover);
  --wa-green: var(--color-wa);
  --danger: var(--color-danger);
  --warning: var(--color-warning);
  --text-main: var(--color-text-main);
  --text-muted: var(--color-text-muted);
  --bg-page: var(--color-bg);
  --bg-card: var(--color-surface);
  --border: var(--color-border);
  
  /* 排版與空間變數 */
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius: var(--radius-lg);
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.06);
  --shadow: var(--shadow-md);
}

/* === 全局重置 (Global Reset & Base) === */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-stack);
  font-size: 19px;
  line-height: 1.75;
  color: var(--color-text-main);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-bottom: 90px;
}

/* === 頂部導航列 (Navbar) === */
.navbar {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.03);
}

.nav-container {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
}

.nav-brand {
  font-size: 20px;
  font-weight: 800;
  color: var(--color-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: -0.3px;
}

.nav-brand span {
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  gap: 20px;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 16px;
  font-weight: 600;
  transition: color 0.2s ease;
  padding: 6px 4px;
}

.nav-links a:hover {
  color: var(--color-accent);
}

.nav-links a.active {
  color: var(--color-primary);
  font-weight: 700;
  border-bottom: 2px solid var(--color-accent);
}

/* === 主版面容器 (Container & Layout) === */
.container {
  width: 100%;
  max-width: 860px;
  margin: 24px auto;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

.container-narrow {
  max-width: 760px;
}

/* === 排版階梯 (Typography Hierarchy) === */
h1 {
  font-size: 30px;
  line-height: 1.35;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

h2 {
  font-size: 24px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--color-primary);
  margin: 32px 0 16px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

h3 {
  font-size: 20px;
  line-height: 1.45;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

h4 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

p {
  font-size: 18px;
  line-height: 1.75;
  color: var(--color-text-main);
  margin-bottom: 16px;
}

.lead-text {
  font-size: 19px;
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: 24px;
}

.badge-tag, .badge {
  display: inline-flex;
  align-items: center;
  background: var(--color-accent-light);
  color: var(--color-accent-text);
  font-size: 15px;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 14px;
  line-height: 1.3;
}

/* === Bento Grid 便當盒佈局體系 === */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 16px;
  margin: 24px 0;
}

.bento-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.bento-card:hover {
  border-color: #99F6E4;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.bento-card.highlight {
  background: #F0FDFA;
  border: 2px solid var(--color-accent);
}

.bento-card.warning-box {
  background: var(--color-danger-bg);
  border: 1px solid #FECACA;
}

.bento-col-12 { grid-column: span 12; }
.bento-col-8  { grid-column: span 8; }
.bento-col-7  { grid-column: span 7; }
.bento-col-6  { grid-column: span 6; }
.bento-col-5  { grid-column: span 5; }
.bento-col-4  { grid-column: span 4; }

/* 網格卡片（相容性類別） */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 20px 0;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin: 20px 0;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: 0.2s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

/* === 無障礙按鈕體系 (Touch Targets >= 52px) === */
.btn, .btn-primary, .btn-whatsapp, .btn-wa, .btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 52px;
  font-size: 18px;
  font-weight: 700;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  border: none;
  padding: 12px 24px;
  text-align: center;
  transition: all 0.2s ease;
  line-height: 1.3;
}

.btn-primary {
  background: var(--color-accent);
  color: #FFFFFF;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

.btn-whatsapp, .btn-wa {
  background: var(--color-wa);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(37, 211, 102, 0.3);
}

.btn-whatsapp:hover, .btn-wa:hover {
  background: var(--color-wa-hover);
  box-shadow: 0 6px 18px rgba(37, 211, 102, 0.4);
}

.btn-secondary {
  background: #FFFFFF;
  color: var(--color-primary);
  border: 2px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

/* === 自測問卷與選項組件 (Interactive Quiz UI) === */
.quiz-question {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 20px;
}

.quiz-question h4 {
  font-size: 18px;
  margin-bottom: 14px;
  color: var(--color-primary);
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.quiz-options label {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  font-size: 17px;
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.quiz-options label:hover {
  border-color: var(--color-accent);
  background: #F0FDFA;
}

.quiz-options input[type="radio"],
.quiz-options input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--color-accent);
  cursor: pointer;
}

/* === 套裝卡片與結算區塊 (Bundle & Checkout UI) === */
.bundle-card {
  background: #F0FDFA;
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin: 28px 0;
  position: relative;
}

.bundle-badge {
  position: absolute;
  top: -14px;
  right: 20px;
  background: var(--color-danger);
  color: #FFFFFF;
  padding: 4px 16px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  box-shadow: 0 2px 6px rgba(239, 68, 68, 0.3);
}

.bundle-select-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 16px;
  padding: 16px;
  background: #FFFFFF;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.bundle-select-box label {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
  width: 100%;
}

/* 表格優化 */
.table-wrap {
  overflow-x: auto;
  margin: 20px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

th, td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
  font-size: 16px;
}

th {
  background: var(--color-bg);
  color: var(--color-primary);
  font-weight: 700;
}

.prod-link {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 600;
}

.prod-link:hover {
  text-decoration: underline;
}

.qty-ctrl {
  display: flex;
  align-items: center;
  gap: 6px;
}

.qty-btn {
  width: 32px;
  height: 32px;
  border: 1px solid var(--color-border);
  background: #FFFFFF;
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
  font-size: 16px;
}

.qty-inp {
  width: 44px;
  height: 32px;
  text-align: center;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 16px;
}

/* 表單與結算 */
.form-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin: 25px 0;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  margin-bottom: 14px;
}

.form-group.full {
  grid-column: span 2;
}

.form-group label {
  display: block;
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-text-main);
}

.form-group input, .form-group select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 16px;
}

.summary-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin: 25px 0;
}

.sum-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
  font-size: 16px;
}

.sum-total {
  display: flex;
  justify-content: space-between;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 2px dashed var(--color-border);
  font-size: 20px;
  font-weight: 800;
  color: var(--color-primary);
}

/* === 免責聲明與運費條款 (Disclaimer & Terms) === */
.disclaimer-box, .terms-box {
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-top: 30px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--color-text-sub);
}

.disclaimer-box strong, .terms-box h4 {
  color: var(--color-text-main);
  font-size: 16px;
  margin-bottom: 8px;
  display: block;
}

/* === 頁尾 (Footer) === */
footer {
  text-align: center;
  margin-top: 40px;
  padding: 24px 20px;
  font-size: 15px;
  color: var(--color-text-sub);
  border-top: 1px solid var(--color-border);
}

.footer-links {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 600;
}

.footer-links a:hover {
  text-decoration: underline;
}

/* === 手機端響應式微調 (Responsive Mobile RWD) === */
@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    gap: 10px;
  }
  
  .container {
    padding: 24px 18px;
    margin: 14px auto;
  }
  
  h1 { font-size: 26px; }
  h2 { font-size: 22px; }
  body { font-size: 18px; }
  
  .bento-col-12, .bento-col-8, .bento-col-7, .bento-col-6, .bento-col-5, .bento-col-4 {
    grid-column: span 12;
  }
  
  .grid-2 {
    grid-template-columns: 1fr;
  }
  
  .form-grid {
    grid-template-columns: 1fr;
  }
  
  .form-group.full {
    grid-column: span 1;
  }
}